Coleopterological Notices, VI. 541 



occasionally with two or three very slender distant external 

 spines, these being completely obsolete as a rnle. 



Antennae short, feebly incrassate, only slightly thongh dis- 

 tinctly serrate, with the first joint always much dilated and darker 

 in color, the fifth larger than the fourth or sixth, and the eleventh 

 evenly elongate-ovoidal and obtusely acuminate. The prothorax 

 is dilated toward base, with the lateral edges minutely serrulate 

 and having a close-set even fringe of short posteriori}' and supe- 

 riorly recurved setae, which are almost invariably pale ash}' white 

 in color, the apical angles alwaj's very obtuse. Epipleurai very 

 narrow but dilated toward base, with their plane strongly in- 

 clined upward throughout. The ungual appendages are thick, 

 equal and fully as long as the claws, the apical third or fourth of 

 which is free. 



The author of the genus did not seem to have a very clear con- 

 ception of its real scope, as the first species which he assigned to 

 it — constricticollis (=zconstrictus Lee.) — is generically quite dis- 

 tinct from the species of LeConte and Mannerheim, which he 

 subsequently states should be included, and which alone agree 

 with his generic diagnosis in having the sides of the prothorax 

 serrulate. The other tvvo species described by Motschulsky have 

 not been identified and are probably also generically different 

 from rotundicollis, canescens, etc. I agree with LeConte, how- 

 ever, that it is probably the best course to regard Listrus as con- 

 stituted below, and not as the equivalent of Eschatocrepis Lee. 

 Our species are numerous, and those before me may be quite 

 readily distinguished among themselves as follows : — 



Interspaces between the pronotal punctures, finely, evenly and closely punctu- 

 lato-rugulose. 

 Prothorax broadly arcuato-truncate at apex, the latter fully as wide as the 



head 1. rotundicollis 



Prothorax much more narrowed anteriorly, the apex narrower than the 

 head, sinuato-truncate and with more distinct angles; pubescence less 



al)breviated 2. intei'Stitialis 



Interspaces smooth or coarsely rugose. 



Elytra without a broad denuded fascia at the middle 2 



Elytra with a broad dark (}uasi-denuded transverse fascia at the middle; 



small species 9 



Elytra with variegated pubescence and a conspicuous rlioml)oidal (juasi- 



denuded fascia at apicjil fourth ; small species 12 



2 — Larger species, 3 mm. or more in length, the denuded areas of the elytra in 

 the form of isolated spots or very uneven and inteiTupted fasciic 3 



